FCguy
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I think I found an error in a webassign problem. What do you think?
WebAssign is right (at least in this case).FCguy said:I think I found an error in a webassign problem. What do you think?
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tony873004 said:In that term, you should be using 0.05m (12.0 N) sin(60) or cos(30) which gives an answer of -3.85.
-3.77 is within 3% of the correct answer. So now you know your teacher set the tolerance to at least 3%. :)
tony873004 said:Is this problem directly from Webassign, or did your teacher create it? Webassign allows instructors to create their own problems. They have to spell out the solutions in Perl programming language. Maybe your teacher made a mistake
Actually, you're right! The pull is tangent. 30 degrees doesn't have anything to do with the problem. The angle is 0 from the tangent I fell for the trap. -3.77 is correct. I didn't catch the red herring! Nothing ambiguous here. Like I said a few posts ago, I often make the same mistakes as my students.Nathanael said:I had the same instinct as Sammy, namely that the 12N force was tangent and the dotted line was a red herring.
The answer depends on where the force is being applied, which is a bit ambiguous from the picture.
Nathanael said:I had the same instinct as Sammy, namely that the 12N force was tangent and the dotted line was a red herring.
The answer depends on where the force is being applied, which is a bit ambiguous from the picture.